Sprint Nextel 755P ユーザーズマニュアル

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Basics
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Resetting Your Device
If your device is not responding or you have trouble synchronizing with your computer, a 
soft reset may help. All your information is retained when you perform a soft reset.
1.
Press Power/End 
 to turn off the screen. 
2.
Press the battery door release, and slide the battery door downward to remove it 
from your device.
3.
Remove the battery from the battery compartment.
4.
Align the metal contacts on the battery with the contacts inside the battery 
compartment, insert the battery at a 45-degree angle, and then press it into place.
5.
Slide the battery door onto the back of your device until it clicks into place.
Tip:
If the phone and Bluetooth signals were on before a reset, these 
signals automatically turn on after the reset.
If your device still does not respond after a soft reset, you may need to 
do a system reset or a hard reset. See the User Guide.